High dynamic range video with synthesized gain control

HDR (High Dynamic Range) image processing is quite common, but there is much less study in HDR processing for videos. AGC (Automatic Gain Control), a general method for camera to adjust the brightness of image, has been used in most camera devices. This paper introduced a novel way of utilizing AGC function to produce HDR videos. Our approach does not need extra devices and no extra information is recorded during the whole process. In this paper, a new model called SGV is introduced which combines gain value and exposure settings and can be estimated from the intensities of frames. After processing, a video with uniform brightness in every frame can be obtained. As a byproduct, we can also get a HDR panoramic image at the same time.